[Interpreter] Enable allocation site mementos in CreateArrayLiterals.

src/compiler/bytecode-graph-builder.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/bytecode-graph-builder.h"
 
+#include "src/ast/ast.h"
 #include "src/compilation-info.h"
 #include "src/compiler/bytecode-branch-analysis.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/operator-properties.h"
 #include "src/interpreter/bytecodes.h"
 #include "src/objects-inl.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
@@ skipping 986 matching lines @@
   const Operator* op = javascript()->CreateLiteralRegExp(
       constant_pattern, literal_flags, literal_index);
   BuildCreateLiteral(op);
 }
 
 void BytecodeGraphBuilder::VisitCreateArrayLiteral() {
   Handle<FixedArray> constant_elements = Handle<FixedArray>::cast(
       bytecode_iterator().GetConstantForIndexOperand(0));
   int literal_index = bytecode_iterator().GetIndexOperand(1);
   int literal_flags = bytecode_iterator().GetFlagOperand(2);
+  // Disable allocation site mementos. Only unoptimized code will collect
+  // feedback about allocation site. Once the code is optimized we expect the
+  // data to converge. So, we disable allocation site mementos in optimized
+  // code. We can revisit this when we have data to the contrary.
+  literal_flags |= ArrayLiteral::kDisableMementos;
   int number_of_elements = constant_elements->length();
   const Operator* op = javascript()->CreateLiteralArray(
       constant_elements, literal_flags, literal_index, number_of_elements);
   BuildCreateLiteral(op);
 }
 
 void BytecodeGraphBuilder::VisitCreateObjectLiteral() {
   FrameStateBeforeAndAfter states(this);
   Handle<FixedArray> constant_properties = Handle<FixedArray>::cast(
       bytecode_iterator().GetConstantForIndexOperand(0));
@@ skipping 939 matching lines @@
     // Phi does not exist yet, introduce one.
     value = NewPhi(inputs, value, control);
     value->ReplaceInput(inputs - 1, other);
   }
   return value;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8